Research on Dynamic Mechanisms and Comprehensive Mitigation Strategies for Touch Line Faults in Ultra-High Voltage AC-DC Hybrid Systems

Junwei Ha

doi:10.47297/taposatWSP2633-456907.20260708

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Research on Dynamic Mechanisms and Comprehensive Mitigation Strategies for Touch Line Faults in Ultra-High Voltage AC-DC Hybrid Systems

Volume 7, Issue 8

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Research on Dynamic Mechanisms and Comprehensive Mitigation Strategies for Touch Line Faults in Ultra-High Voltage AC-DC Hybrid Systems
Research on Dynamic Mechanisms and Comprehensive Mitigation Strategies for Touch Line Faults in Ultra-High Voltage AC-DC Hybrid Systems
Emergency Equipment College, Emergency Management University, Langfang, Hebei, 065201, China
Vol. 7, Issue 8, Pages: 36-40(2026)
Published：30 August 2026
DOI：10.47297/taposatWSP2633-456907.20260708
Accepted：

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Ha Junwei.Research on Dynamic Mechanisms and Comprehensive Mitigation Strategies for Touch Line Faults in Ultra-High Voltage AC-DC Hybrid Systems[J].Theory and Practice of Science and Technology,2026,07(08):36-40.
DOI：

Ha Junwei.Research on Dynamic Mechanisms and Comprehensive Mitigation Strategies for Touch Line Faults in Ultra-High Voltage AC-DC Hybrid Systems[J].Theory and Practice of Science and Technology,2026,07(08):36-40. DOI： 10.47297/taposatWSP2633-456907.20260708.

摘要

Abstract

China's ultra-high voltage (UHV) AC–DC hybrid grid features a "strong DC

weak AC" structure with insufficient inertia and reactive support. Line contact faults caused by ice shedding

wind deflection and vegetation encroachment easily trigger beat frequency distortions

inter-area oscillations and commutation failures via AC–DC coupling

further inducing cascading instability

which severely threatens the safety of multi-infeed HVDC systems.This paper systematically investigates the dynamic evolution mechanism of line contact faults and proposes integrated suppression strategies. A comprehensive literature review sorts three research branches: galloping dynamics

beat-frequency disturbance generation and AC–DC instability control

and points out key deficiencies of existing studies

including ignored AC–DC coupling amplification effects

lack of quantitative beat-frequency coupling analysis

and single-mode control without full-process coordinated defense.Combining literature induction

engineering case reproduction and multi-scenario comparative simulation

this paper identifies four core technical bottlenecks. Three innovations are presented: a multi-scale coupled model revealing the full evolution of beat-frequency disturbances

a joint simulation platform reproducing cascading instability

and a full-process coordinated defense scheme integrating fault identification

adaptive DC damping and rapid fault isolation.The results enrich the dynamic fault theory of UHV hybrid grids and provide systematic technical support for grid dispatching

line maintenance and AC–DC protection optimization

improving the fault resilience of new power systems.

关键词

Keywords

references

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